WO2010064438A1 - 制御局装置、送信局装置、通信方法、及び通信システム - Google Patents

制御局装置、送信局装置、通信方法、及び通信システム Download PDF

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Publication number
WO2010064438A1
WO2010064438A1 PCT/JP2009/006594 JP2009006594W WO2010064438A1 WO 2010064438 A1 WO2010064438 A1 WO 2010064438A1 JP 2009006594 W JP2009006594 W JP 2009006594W WO 2010064438 A1 WO2010064438 A1 WO 2010064438A1
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Prior art keywords
spectrum
signal
interference
band
station apparatus
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PCT/JP2009/006594
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English (en)
French (fr)
Japanese (ja)
Inventor
増野淳
杉山隆利
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日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to KR1020117011742A priority Critical patent/KR101320010B1/ko
Priority to CN200980147020.9A priority patent/CN102224759B/zh
Priority to JP2010541243A priority patent/JP5127932B2/ja
Priority to US13/128,206 priority patent/US8798024B2/en
Priority to EP09830208.6A priority patent/EP2352351B1/de
Publication of WO2010064438A1 publication Critical patent/WO2010064438A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only

Definitions

  • the present invention relates to communication using a multicarrier signal, and more particularly, to a control station apparatus, a transmission station apparatus, a communication method, and a communication system in a multicarrier communication system to which an error correction code is applied.
  • FIG. 27 is a conceptual diagram showing the whole of two wireless LAN (Local Area Network) systems having different frequency channels as an example of a combination of wireless communication systems sharing a frequency band.
  • the wireless communication system includes wireless LAN base stations 2a and 2b and a receiver 1a.
  • the wireless LAN base station 2a communicates using the frequency band of CH1, which is the center frequency fa.
  • the wireless LAN base station 2b communicates using the frequency band of CH5 having the center frequency fb (fa ⁇ fb).
  • the receiver 1a is arranged at a position where the wireless signals of both the wireless LAN base station 2a and the wireless LAN base station 2b reach, and two wireless signals of a wireless signal of the center frequency fa and a wireless signal of the center frequency fb. Receive signals whose signals partially interfere with each other.
  • the transmission frequency band of the desired wave that is the center frequency fa and the transmission of the interference wave from the wireless LAN base station 2b that is the center frequency fb.
  • Even in the frequency sharing type wireless communication in which the frequency band partially overlaps (overlaps) it is essential that the receiver 1a accurately receives the desired wave.
  • systems having different communication methods such as a combination of a wireless LAN system, Bluetooth (registered trademark), and WiMAX (registered trademark) may share the frequency.
  • the receiver 1a shown in FIG. 27 uses the wireless LAN base station 2a as a communication target.
  • the transmission frequency band of the desired wave from the wireless LAN base station 2a having the center frequency fa and the transmission frequency band of the interference wave from the wireless LAN base station 2b having the center frequency fb partially overlap ( Duplicate.
  • Non-Patent Document 3 describes an adaptive modulation OFDM (Orthogonal Frequency Division Multiplexing) system in which the allocation modulation scheme is changed according to the reception level for each subcarrier.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Non-Patent Document 1 discloses an underlay-type superimposed transmission in which a spread spectrum signal is superimposed on a signal that is not spread spectrum.
  • the superposition ratio is generally 100%, but the spread spectrum system has a problem in that the transmission speed is limited or a huge frequency band is required to realize high-speed transmission.
  • signals cannot be superimposed and transmitted between communication systems that are not spread spectrum.
  • Non-Patent Document 2 shows the downlink when the same communication system is used. For terminal stations that can ensure a sufficient D / U (Desired to Undesired signal ratio). Only superposition transmission using the same subcarrier is performed.
  • the present invention has been made in view of such circumstances and has been made to solve the above-described problems.
  • the object of the present invention is to provide a technology capable of improving frequency utilization efficiency in communication using multicarrier signals. There is to do. More specifically, an object of the present invention is to provide a control station device, a transmission station device, a communication method, and a communication system that can ensure communication quality and effectively use frequencies in a plurality of systems.
  • an object of the present invention is to provide a multicarrier signal transmission station apparatus and communication method capable of realizing wireless communication according to the priority for each user even when interference occurs in a part of the used band. And providing a communication system.
  • the present invention is a communication method in a communication system including a transmitting station apparatus and a receiving station apparatus that transmit and receive a multicarrier signal using a spectrum including a plurality of subcarriers.
  • the communication method is a communication method in which the communication system performs communication three or more at the same time, and the receiving station device is the other in the spectrum arranged in the own communication system.
  • the bandwidth of the spectrum is variable for each communication system, and in the spectrum arrangement step, two spectrums having a narrower bandwidth than the other spectrums among the spectra. May be arranged at the end of the use frequency band, and each spectrum may be arranged so that the superposition rate is constant in each spectrum.
  • the interference suppression step may perform interference suppression by attenuating the received signal in the recognized superimposed band using a frequency filter.
  • the interference suppression step masks the likelihood of the received signal in the recognized superimposed band, and the error correction decoding step applies the likelihood to the received signal masked.
  • the multicarrier signal addressed to the own receiving station apparatus may be received by performing error correction decoding.
  • the spectrum arrangement step may arrange the spectrum based on a result detected by an interference signal detector provided in the receiving station apparatus.
  • the spectrum arrangement step may arrange the spectrum based on a result detected by an interference signal detector provided in the transmission station apparatus.
  • the spectrum allocation step is based on a result detected by an interference signal detection unit provided in a control station apparatus different from both the transmitting station apparatus and the receiving station apparatus.
  • the spectrum may be arranged.
  • the coding / modulation step for coding and modulating the user's data, and the user's data A superposition rate determination step for setting a superposition rate, which is a ratio of an interference band in a frequency band used for transmission, lower than a superposition rate, which is a ratio of an interference band in a frequency band used by the multicarrier signal; and the superposition rate determination
  • the encoded and modulated user data is sent to the subcarrier allocation step.
  • the user's superposition rate is set lower than the superposition rate, which is the ratio of the interference band in the frequency band used by the multicarrier signal, and when the user's service quality requirement is lower than the predetermined service quality,
  • the overlap ratio of the user is the ratio of the interference band in the frequency band used by the multicarrier signal.
  • the user data is assigned to non-interference bands and subcarriers in the interference band, and in the multi-carrier modulation step, the user data encoded and modulated in the encoding / modulation step for each user, You may make it modulate to the subcarrier allocated to the data of the said user in a subcarrier allocation step.
  • the present invention provides a spectrum arrangement when three or more communication systems including a transmission station apparatus and a reception station apparatus that transmit and receive a multicarrier signal using a spectrum including a plurality of subcarriers perform simultaneous communication.
  • a control station apparatus for determining an interference signal detection unit for detecting an interference signal in a superposed band with another communication system in the spectrum, a bandwidth of each spectrum, and a predetermined decision that each spectrum is superposed on another spectrum.
  • a superposition rate derived from the superposed bandwidth a spectrum placement unit for placing each spectrum such that the superposition rate is constant in each spectrum, and transmitting the multicarrier signal using the assigned spectrum Recognizing a superimposed band between the transmitting station apparatus and another communication system in the arranged spectrum, the superimposed band
  • a spectrum allocating unit for allocating a spectrum arranged in a communication system that communicates with the receiving station device that receives a multicarrier signal addressed to the receiving station device by applying error correction decoding to the signal and applying error correction decoding to the signal
  • a control information distribution unit that notifies the allocated spectrum to the transmitting station device of the own communication system and other communication systems.
  • the present invention is a transmission station apparatus in a communication system including a transmission station apparatus and a reception station apparatus that transmit and receive a multicarrier signal using a spectrum including a plurality of subcarriers, and the multicarrier signal And a controller configured to set a superposition rate that is a ratio of using a superimposition band in which interference occurs in the use frequency band so as to increase frequency use efficiency of the use frequency band used for transmission of the superimposition And a transmitter that transmits the multicarrier signal using a spectrum allocated according to a rate.
  • the communication system performs communication three or more simultaneously, and the control unit determines a bandwidth of each spectrum and a predetermined overlapping bandwidth in which each spectrum is superimposed on another spectrum. From the above, a superposition rate may be derived, and a spectrum placement unit that places each spectrum so that the superposition rate is constant in each spectrum, and a spectrum assignment unit that assigns a spectrum placed in the communication system may be provided.
  • the transmission station apparatus of the present invention may include an interference signal detection unit that detects an interference signal in a superimposed band with another communication system in the spectrum in order to perform the spectrum arrangement.
  • an encoding / modulation unit that encodes and modulates user data, and when the user's service quality requirement is higher than a predetermined service quality, A superposition ratio determining unit that sets a superposition ratio that is a ratio of an interference band in a frequency band used for data transmission to be lower than a superposition ratio that is a ratio of an interference band in a frequency band used by the multicarrier signal; and the superposition ratio A subcarrier allocating unit for allocating user data encoded and modulated by the encoding / modulating unit to subcarriers in a non-interference band and an interference band according to a superimposition rate set by a determination unit; and the encoding / modulating unit
  • the user data encoded and modulated by the subcarrier allocator is modulated by the subcarrier allocated by the subcarrier allocation unit.
  • Ji carrier modulation unit a parallel-serial converter for sub-carriers modulated by said multi-carrier modulation section
  • the transmission station apparatus of the present invention a plurality of the encoding / modulating units are provided, each of the plurality of encoding / modulating units performs encoding and modulation of different user data, and the superimposition rate determining unit
  • the service quality requirement of the user is such that the average superposition ratio of the entire user matches the superposition ratio that is the ratio of the interference band in the frequency band used by the multicarrier signal.
  • the user's service quality requirement is set to be lower than the superposition rate, which is a ratio of the interference band in the frequency band used by the multicarrier signal.
  • the subcarrier allocating unit performs encoding and modulation by the encoding / modulating unit for each user according to the superimposition rate of the user set by the superimposition rate determining unit.
  • the modulated user data is allocated to the non-interference band and the subcarriers of the interference band, and the multi-carrier modulation unit assigns the user data encoded and modulated by the encoding / modulation unit for each user.
  • the subcarrier allocation unit may modulate the subcarriers allocated to the user data.
  • the superimposition rate determination unit sets the superimposition rate of the user to be high, and When the data reception quality is lower than the predetermined threshold, the superimposition rate of the user may be set low.
  • the transmission station apparatus of the present invention further includes a modulation and coding level determination unit that determines a modulation and coding level based on a superposition rate set by the superposition rate determination unit, and the encoding / modulation unit May encode and modulate the user data according to the modulation and coding level determined by the modulation and coding level determination unit.
  • the present invention provides a spectrum arrangement when three or more communication systems composed of a transmission station apparatus and a reception station apparatus that transmit and receive a multicarrier signal using a spectrum including a plurality of subcarriers perform simultaneous communication.
  • a superposition ratio is derived from a bandwidth of each spectrum and a pre-determined superposition bandwidth in which each spectrum superimposes another spectrum so that the superposition ratio is constant in each spectrum.
  • a spectrum allocation unit that allocates each spectrum; a spectrum allocation unit that allocates the allocated spectrum; a transmission unit that transmits the multicarrier signal using the allocated spectrum; and other communication in the allocated spectrum Recognizing the overlap band with the system and applying interference suppression technology to the overlap band Signal and a a receiving section that receives a multicarrier signal addressed to its own receiving section by error correction decoding the.
  • frequency utilization efficiency of a used frequency band used for transmission of the multicarrier signal can be improved by setting a superposition rate.
  • the spectrum arrangement Determined when a communication system composed of a transmitting station apparatus and a receiving station apparatus that transmit and receive a multicarrier signal using a spectrum including a plurality of subcarriers performs communication at the same time three or more, the spectrum arrangement Determined.
  • the transmitting station apparatus transmits a multicarrier signal using a spectrum allocated to the own system.
  • the receiving station apparatus recognizes in advance the overlapping band with another communication system in the spectrum arranged in its own system.
  • the receiving station apparatus applies an interference suppression technique to the superimposed band, and receives a multicarrier signal addressed to the receiving station apparatus by performing error correction decoding on a signal to which the interference suppression technique is applied.
  • a superposition rate is derived from the bandwidth of each spectrum and a predetermined superposition bandwidth where each spectrum is superposed on another spectrum, and each spectrum is arranged so that the superposition rate is constant in each spectrum.
  • the frequency placement method can reduce the influence of superposition for each spectrum, ensure substantial communication quality, and effectively use the frequency. Can provide.
  • the spectrum bandwidth is variable for each communication system, and in the spectrum placement step, two spectra having a narrower bandwidth than other spectra are placed at the end of the used frequency band, and the superposition rate Each spectrum is arranged so that is constant in each spectrum. With such an arrangement, a predetermined band can be secured even in a spectrum with a narrow bandwidth. Furthermore, it is possible to increase the overall transmission efficiency by arranging the spectra so that the superposition rate is constant in each spectrum.
  • the receiving station performs interference suppression by attenuating the received signal in the recognized superimposition band using a frequency filter. Thereby, a band including the interference wave can be removed, and the interference wave of the received reception signal can be suppressed.
  • the receiving station masks the likelihood of the received signal in the recognized superimposition band, and performs error correction decoding on the received signal with the masked likelihood, thereby performing a multicarrier signal addressed to the receiving station device. Receive. Thereby, the spectrum including the interference wave can be removed, and the interference wave of the received signal received can be suppressed.
  • the multi-carrier signal transmitting station apparatus when interference occurs in a part of the frequency band of the desired wave, changes the superposition rate according to the priority for each user, It becomes possible to perform wireless communication with quality according to the required priority. Further, it is possible to improve the frequency utilization efficiency by changing the superposition rate according to the data reception quality.
  • FIG. 1 is a block diagram illustrating a communication system according to a first embodiment of the present invention. It is a figure which shows the superimposition of the frequency arrangement
  • FIG. 1 is a block diagram showing a communication system according to a first embodiment of the present invention.
  • communication systems 100, 700, and 800 are shown as three communication systems that perform communication using radio waves of the same frequency.
  • the communication systems 100, 700, and 800 are independent communication systems using the same system configuration.
  • the communication system 100 includes a base station device 110 and a terminal station device 120.
  • the communication system 700 includes a base station device 710 and a terminal station device 720.
  • the communication system 800 includes a base station device 810 and a terminal station device 820.
  • FIG. 2A shows a signal W1 that carries a desired signal assigned to the frequency axis, and a signal W2 that is assigned by overlapping the signal W1 and a part of the band (band fb12).
  • the vertical axis represents power and the horizontal axis represents frequency.
  • Signal W1 has a band fa1 indicated by a Nyquist frequency that accommodates a plurality of subcarriers SC1-1 to SC1-n carrying signal W1.
  • Signal W2 has a band fa2 indicated by a Nyquist frequency that accommodates a plurality of subcarriers SC2-1 to SC2-n carrying signal W2.
  • the desired signal is signal 1
  • the desired wave is transmitted in band fa1
  • the carrier wave that carries signal 2 transmitted in band fa2 becomes an interference wave.
  • FIG. 2B In the frequency array shown in FIG. 2B, an assignment without overlapping bands is shown.
  • the vertical axis represents power and the horizontal axis represents frequency.
  • a signal W1 carrying a desired signal assigned to the frequency axis and a signal W2 adjacent to the signal W1 via a guard band (fg12) are shown.
  • the signal W1 and the signal W2 shown in FIG. 2B have the same band fa1 and band fa2 as in FIG. 2A. Therefore, in the conventional allocation method in which allocation is performed without superimposing, the occupied frequency band is widened and the use efficiency is increased. Decreased.
  • the signal W3 is a signal in which a part of the band (band fb23) overlaps with the signal W2.
  • the vertical axis represents power and the horizontal axis represents frequency. Since the band of the signal W2 shown in this figure is superimposed not only on the signal W1 but also on the signal W3, the superposition ratio is
  • each communication system is assigned one of the bands shown in FIG. 2C.
  • each communication system receives radio waves from other communication systems, it is possible to clearly indicate a range in which the influences of interference may be received from each other.
  • the base station apparatus 110 in the communication system 100 includes a transmission unit 111, a reception unit 112, a control unit 113, and an antenna 114.
  • Transmitting section 111 in base station apparatus 110 generates a transmission signal for terminal station apparatus 120.
  • the transmission unit 111 includes a transmission baseband signal generator 111a and an up-converter device 111b.
  • a transmission baseband signal generator 111a in the transmission unit 111 generates a transmission baseband signal based on information to be transmitted.
  • the generated transmission baseband signal is output in synchronization with the transmission frequency.
  • the transmission frequency is determined according to the allocated band and is controlled by the bandwidth control information.
  • the up-converter device 111b performs frequency conversion on the input transmission baseband signal based on the set transmission frequency, and outputs it.
  • the transmission signal output from the up-converter device 111b is transmitted from the antenna 114 via a transmission signal processing unit (not shown) that performs coding processing, error correction coding processing, modulation processing, and the like (not shown).
  • the output radio signal is assigned to a channel having a band carried by a plurality of subcarriers.
  • the receiving unit 112 performs a reception process on an input reception signal.
  • the receiving unit 112 includes an interference wave detection device 112a.
  • Interference wave detection apparatus 112a detects a frequency band in which interference is generated by a radio signal transmitted from another system, from a received signal, among the use frequency bands in the desired wave of base station apparatus 110. For example, in an environment where the desired wave is not transmitted, the interference wave detecting device 112a detects the presence / absence of other radio signals, signal strength, etc. for each subcarrier in the use frequency band of the desired wave. The specific subcarrier to be detected is detected.
  • the interference wave detection apparatus 112a uses an interference band determination value sequence in which “1” is associated with a subcarrier that is a specific subcarrier and “0” is associated with a subcarrier other than the specific subcarrier. Then, a sequence of specific subcarrier determination values is generated. The interference wave detection device 112a outputs the detection result as interference wave information.
  • the frequency allocation device 113a in the control unit 113 selects a channel to be used in the own communication system according to a predetermined rule based on an interference band determination value indicating an interference state for each subcarrier input as interference wave information.
  • the frequency changing device 113b assigns the frequency used in each subcarrier according to the frequency arrangement in the channel, and changes the transmission frequency according to the assigned frequency.
  • the bandwidth changing device 113c selects a bandwidth that can be transmitted by the communication system according to a predetermined rule based on an interference band determination value indicating an interference state for each subcarrier input as interference wave information.
  • the bandwidth changing device 113c controls the bandwidth transmitted by the transmission unit 111 based on the selected bandwidth.
  • the terminal station device 120 In the communication system 100, the terminal station device 120 always scans the frequency and follows the frequency allocation transmitted by the opposing base station device 110.
  • the terminal station device 120 includes a transmission unit 121, a reception unit 122, and a control unit 123.
  • the transmission unit 121 in the terminal station device 120 converts a signal transmitted from the terminal station device 120 into a radio signal and outputs the radio signal via the antenna 124.
  • the transmission part 121 produces
  • the receiving unit 122 receives a radio signal from the opposing base station apparatus 110.
  • the interference band of the radio signal received by the receiving unit 122 includes an interference signal. In order to reduce the influence of the interference signal, the receiving unit 122 has a configuration for removing the interference signal.
  • FIG. 3 is a block diagram showing the receiving station apparatus according to the first embodiment.
  • the receiving unit 122 includes a BWL filter 122a, a demodulator 122b, an interference wave detection device 122c, a mask processing unit 122d, and a decoder 122e.
  • a BWL filter (Bandwidth Limitation filter) 122a in the receiving unit 122 selectively transmits a band of a desired channel.
  • the demodulator 122b converts the received radio signal including the desired wave subjected to error correction coding into an electric signal for each subcarrier, and outputs demodulated values DM1 to DM8 for each demodulated subcarrier.
  • the interference wave detection device 122c recognizes the interference wave by detecting the interference signal in the interference band from the band of the channel based on the input received signal.
  • the mask processing unit 122d includes a mask code generator 122d1, a mask processing unit 122d2, and a combiner 122d3.
  • the mask code generator 122d1 in the mask processing unit 122d outputs a masking code for masking the demodulated value of the subcarrier to be masked according to the input interference signal for each subcarrier.
  • demodulated values of subcarriers to be masked are demodulated values DM7 and DM8.
  • a subcarrier to be masked is indicated by “0”, and a subcarrier not to be masked is indicated by “1”.
  • the mask processing unit 122d2 performs multiplication processing according to the input demodulated value and the generated masking code. As a result of the multiplication processing, mask processing is performed, demodulated values DM7 and DM8 are replaced with “0”, and signals from other demodulated values DM1 to DM6 are transmitted.
  • the combiner 122d3 combines the signals from the demodulated values DM1 to DM6 with “0” obtained by replacing the demodulated values DM7 and DM8, and outputs the combined signal to the decoder 122e as a selected data string. .
  • the decoder 122e performs error correction processing and decoding processing based on the data sequence selected by the mask processing unit 122d, and outputs a decoding result for each subcarrier.
  • a decoding process corresponding to the desired wave encoding method can be selected.
  • the interference signal included in the interference band is removed by the mask processing unit 122d, and the received signal can be decoded.
  • FIG. 4 is a diagram illustrating a frequency arrangement in the first embodiment.
  • the vertical axis represents power and the horizontal axis represents frequency.
  • five channels having different frequency bands are arranged. Since each channel is overlapped, five channels are assigned to a narrower band than the total of the bands of the respective channels. By overlapping each channel, interference occurs in each channel, but error rate reduction can be prevented by error compensation in decoding processing.
  • the channels to be superimposed are channels ch1, ch2, ch3, ch4, and ch5 in order from the lowest frequency, and an array that maximizes the overall transmission capacity is selected.
  • FIG. 4A shows an arrangement example that does not depend on the arrangement method of the present embodiment.
  • the frequency bandwidths fa and fn of each channel have different frequency bandwidths.
  • the frequency bands are clearly different from each other, for example, fa is 10 MHz and fn is 5 MHz. Therefore, when channels having a narrow frequency band are continuously allocated while being superposed, they are shared as a superposed band from both channels adjacent on the frequency axis of the band. As a result, the frequency band that can be occupied decreases, and the substantial communication quality decreases.
  • FIG. 4B shows an arrangement example according to the arrangement method of the present embodiment.
  • the frequency bandwidth f of each channel shown in this figure is shown in an array, it is expressed by the following equation.
  • Channels indicating different frequency bandwidths are assigned to the frequency bandwidths f1, f2, f3, f4 and f5 of each channel.
  • the frequency bandwidth fa occupies a wide frequency range and has a substantially substantial bandwidth as compared with the frequency bandwidth fn.
  • the narrow band spectrum is arranged at the end of the use frequency band. That is, two spectra having a narrower bandwidth than the other spectra are arranged at the end of the use frequency band. More specifically, the narrowest spectrum and the narrowest spectrum next to the spectrum are arranged at the end of the use frequency band. When there are a plurality of narrowest spectrums, two of these spectra are arranged at the end of the use frequency band.
  • the narrowest spectrum and a plurality of narrow band spectra next to the spectrum are included.
  • One of the spectra is arranged at the end of the use frequency band.
  • FIG. 4C shows a case where spectra having different frequency bandwidths are arranged in three channels. When shown in an array from the lowest frequency, it can be shown as follows.
  • the frequency bandwidths fa and fn have the following relationship.
  • the frequency bandwidth fa of the spectrum allocated to the central channel has a bandwidth twice as large as the frequency bandwidth fn of the spectrum allocated to the end channel. Further, as shown in FIG. 4D, comparison is made with a case where the spectrums allocated to the three channels all have the same frequency bandwidth fa.
  • FIG. 4E shows the frequency utilization efficiency calculated in the cases shown in the above (c) and (d).
  • the condition (c) is shown as “present plan”, and the condition (d) is shown as “conventional method”.
  • the selected conditions are as follows.
  • the applied communication system conforms to the DL-FUSC (Down Link-Full Usage of SubChannelization) mode applied to the downlink in the IEEE 802.16e standard.
  • the modulation method is 64QAM (Quadrature Amplitude Modulation) with a coding rate of 1/2
  • the coding method is CTC (Convolutional Turbo Code). As shown in FIG.
  • the frequency utilization efficiency according to the conventional method is 3 bits / sec / Hz (bits / second / hertz), but the frequency utilization efficiency according to this proposal is 4.17 bits / sec / Hz. (Bits / second / hertz). That is, it is shown that the 1.39 times frequency utilization efficiency is increased.
  • FIG. 5 is a flowchart showing the operation of the communication system in the first embodiment.
  • the reception unit 112 receives a reception signal captured by the antenna 114 (step Sa11).
  • the interference wave detection device 112a of the reception unit 112 detects the interference wave (step Sa12).
  • the frequency allocation device 113a selects and arranges a frequency array according to the frequency allocation rule (step Sa13).
  • the frequency allocation device 113a performs frequency allocation (step Sa14).
  • the frequency change device 113b changes the transmission frequency of the transmission unit 111 (step Sa15).
  • the bandwidth changing device 113c selects a bandwidth that can be transmitted in the own communication system, and the transmission unit based on the selected bandwidth
  • the bandwidth transmitted from 111 is controlled.
  • the transmission unit 111 changes the frequency of the clock output from the transmission baseband signal generator 111a according to the bandwidth control.
  • the transmission unit 111 generates a transmission signal by changing the output frequency of the up-converter device 111b, and transmits the transmission signal via the antenna 114 (step Sa16). According to the above procedure, it is possible to determine the transmission frequency transmitted by the base station apparatus 110 based on the interference state in the received signal received by the base station apparatus 110.
  • FIG. 6 is a block diagram showing a communication system according to the second embodiment of the present invention.
  • communication systems 200, 700, and 800 are shown as three communication systems that perform communication using radio waves of the same frequency.
  • the communication systems 200, 700, and 800 are independent communication systems using the same system configuration.
  • FIG. 6 the same components as those in FIG. Hereinafter, a configuration different from FIG. 1 will be described.
  • the communication system 200 includes a base station apparatus 210 and a terminal station apparatus 220 that communicate with each other.
  • the communication system 200 receives radio signals transmitted in the communication systems 700 and 800 as interference waves.
  • the base station apparatus 210 includes a transmission unit 111, a reception unit 212, a control unit 113, and an antenna 114.
  • the reception unit 212 in the base station apparatus 210 performs a reception process on an input reception signal.
  • the reception unit 212 includes a control information extraction device 212a.
  • the control information extraction device 212a extracts information included in the packet transmitted by the radio signal transmitted from the terminal station device 220.
  • the information sent from the terminal station device 220 includes the reception status on the terminal station device 220 side and various setting information in the terminal station device 220 set to adapt to the reception status.
  • the control information extraction device 212a extracts information on the frequency band detected as causing interference from the use frequency band in the radio signal (desired wave) transmitted from the base station device 210, and outputs the information as interference wave information. Based on the extracted interference wave information, the control unit 113 determines a frequency array according to a predetermined rule, and assigns frequencies according to the array.
  • the defined rule is the same rule as the frequency determination rule shown in the first embodiment.
  • the transmission unit 111 outputs a transmission signal according to the allocated frequency. Details of the control unit 113 and the transmission unit 111 are as described with reference to FIG.
  • the terminal station apparatus 220 includes a transmission unit 221, a reception unit 222, a control unit 223, and an antenna 124.
  • the transmission unit 221 in the terminal station apparatus 220 includes a transmission baseband signal generator 221 a that transmits information to the base station apparatus 210.
  • the transmission baseband signal generator 221a generates a packet including information related to the interference wave in the control information unit based on the input control information.
  • the transmission baseband signal generator 221a generates a transmission baseband signal based on packetized interference wave information.
  • the receiving unit 222 receives the radio signal transmitted from the base station apparatus 210 via the antenna 124.
  • the receiving unit 222 performs reception processing on the received signal and extracts received data.
  • the receiving unit 222 also extracts information indicating the reception status on the terminal station device 220 side based on the received radio signal.
  • the receiving unit 222 includes an interference wave detection device 222a.
  • the interference wave detection device 222a in the reception unit 222 uses a frequency band in which interference is generated by a radio signal transmitted from another system, among the use frequency bands in a desired wave transmitted from the base station device 110, from an input reception signal. Is detected. For example, in the environment where the desired wave is not transmitted, the interference wave detection device 222a detects the presence / absence of other radio signals, signal strength, etc.
  • the specific subcarrier to be detected is detected.
  • the interference wave detection apparatus 222a uses a sequence of interference band determination values in which “1” is associated with a subcarrier that is a specific subcarrier and “0” is associated with a subcarrier other than the specific subcarrier. Then, a sequence of specific subcarrier determination values is generated.
  • the interference wave detector 222a outputs the detection result as interference wave information.
  • the control unit 223 includes a control information adding device 223a. Based on the detected interference wave information, the control information adding device 223a in the control unit 223 generates control information including the interference wave information in the information notified to the base station device 210, and inputs the control information to the transmission unit 221.
  • FIG. 7 is a flowchart showing the operation of the communication system in the second embodiment.
  • the receiving unit 222 receives the received signal captured by the antenna 124 (step Sb11).
  • the interference wave detection device 222a of the reception unit 222 detects the interference wave (step Sb12).
  • the control information adding device 223a generates and outputs control information including information on the interference wave based on the detected interference wave information (step Sb13).
  • the transmission baseband signal generator 221a Based on the input control information, the transmission baseband signal generator 221a generates and outputs a packet including information on the interference wave in the control information section.
  • the output packet is converted into a radio signal and transmitted from the terminal station apparatus 220 (step Sb14).
  • the opposing base station apparatus 210 receives the radio signal transmitted from the terminal station apparatus 220.
  • the control information extraction device 212 a in the reception unit 212 extracts information included in the packet transmitted by the radio signal transmitted from the terminal station device 220.
  • the control information extraction device 212a outputs the interference wave information detected by the terminal station device 210 (step Sb15).
  • the frequency allocation device 113a selects and arranges a frequency array according to the frequency allocation rule based on the output interference wave information (step Sb16). Based on the arranged frequency arrangement, the frequency assignment device 113a assigns frequencies (step Sb17). According to the allocated frequency, the frequency changing device 113b changes the transmission frequency of the transmitter 111 (step Sb18).
  • the bandwidth changing device 113c selects a bandwidth that can be transmitted by the own communication system, and transmits based on the selected bandwidth.
  • the bandwidth transmitted from the unit 111 is controlled.
  • the transmission unit 111 changes the frequency of the clock output from the transmission baseband signal generator 111a according to the bandwidth control.
  • the transmission unit 111 generates a transmission signal by changing the output frequency of the up-converter device 111b, and transmits the transmission signal via the antenna 114 (step Sb19). According to the above procedure, it is possible to determine the transmission frequency transmitted by the base station apparatus 210 based on the interference state in the received signal received by the terminal station apparatus 220.
  • FIG. 8 is a block diagram showing a communication system according to the third embodiment.
  • This figure shows communication systems 300, 700c, and 800c as three communication systems that perform communication using radio waves of the same frequency.
  • the communication systems 300, 700c, and 800c are independent communication systems using the same system configuration.
  • the communication system 300 includes a base station device 310 and a terminal station device 120.
  • the communication system 700c includes a base station device 710c and a terminal station device 720.
  • the communication system 800c includes a base station device 810c and a terminal station device 820. In each communication system, the provided base station apparatus and terminal station apparatus communicate using a predetermined frequency.
  • the communication system 300 includes a base station apparatus 310 and a terminal station apparatus 120, and a control station apparatus 330 that controls the base station apparatus 310 and the terminal station apparatus 120.
  • the communication system 300 receives radio signals transmitted in the communication systems 700c and 800c as interference waves.
  • the control station apparatus 330 detects the interference situation due to the interference wave in the radio signal. Based on the interference state, the result of frequency arrangement is notified to the base station apparatus 310 of the communication system 300 and the communication systems 700c and 800c by the communication means.
  • the base station apparatus 310 includes a transmission unit 311, a reception unit 312, a control unit 313, and an antenna 114.
  • the transmission unit 311 in the base station apparatus 310 generates a transmission signal for the terminal apparatus 120.
  • the transmission unit 311 includes a transmission baseband signal generator 311a and an up-converter device 111b.
  • a transmission baseband signal generator 311a in the transmission unit 311 generates a transmission baseband signal based on information to be transmitted.
  • the generated transmission baseband signal is output in synchronization with the transmission frequency.
  • the receiving unit 312 in the base station apparatus 310 performs a reception process on an input reception signal.
  • the control unit 313 includes a control information receiving device 313a and a frequency changing device 313b.
  • the control information receiving device 313a receives the frequency control information transmitted from the control station device 330 and extracts information included in the packet transmitted by the radio signal.
  • Information sent from the control station device 330 is control information for controlling the frequency used in the communication system 300.
  • the control information receiving device 313a extracts the arrangement information of each channel from the frequency control information notified from the control station device 330.
  • the frequency changing device 313b performs frequency arrangement based on the extracted arrangement information of each channel.
  • the control station device 330 includes an interference wave detection device 331, a frequency allocation device 332, and a control information distribution device 333.
  • the interference wave detection device 331 in the control station device 330 has a frequency band in the communication system 300 in which interference occurs due to a radio signal transmitted from another system, among the use frequency bands in the desired wave transmitted by the base station device 310. Detect from the input received signal. For example, in the environment where the desired wave is not transmitted, the interference wave detecting device 331 detects the presence / absence of other radio signals and the signal intensity for each subcarrier in the use frequency band of the desired wave. The specific subcarrier to be detected is detected.
  • the interference wave detection apparatus 331 associates “1” with a subcarrier that is a specific subcarrier and associates “0” with a subcarrier other than the specific subcarrier as a sequence of interference band determination values. Then, a sequence of specific subcarrier determination values is generated. The interference wave detection device 331 outputs the detection result as interference wave information.
  • the frequency allocation device 332 selects a channel to be used in the own communication system based on a predetermined rule based on an interference band determination value indicating an interference state for each subcarrier input as interference wave information. Further, the frequency allocation device 332 determines a frequency array based on the selected result, and performs frequency allocation according to the array.
  • the defined rule is the same rule as the frequency determination rule shown in the first embodiment.
  • the control information distribution device 333 distributes frequency control information including information on the selected channel to the opposing base station device 310 and the communication systems 700c and 800c.
  • FIG. 9 is a flowchart showing the operation of the communication system in the third embodiment.
  • the control station device 330 that manages the frequency arrangement of the communication system 300 receives the reception signal captured by the antenna 334 (step Sc11).
  • the interference wave detection device 331 detects the interference wave and outputs the interference wave information (step Sc12).
  • the frequency allocation device 332 selects and arranges the frequency array according to the frequency allocation rule based on the output interference wave information. (Step Sc13). Based on the arranged frequency arrangement, the frequency allocation device 332 allocates frequencies (step Sc14). The control information distribution device 333 distributes the frequency control information including the allocated frequency information to the base station device 310 and the communication systems 700c and 800c using the communication means (step Sc15).
  • the opposing base station apparatus 310 receives the frequency control information transmitted from the control station apparatus 330.
  • the control information receiving device 313 a in the control unit 313 extracts the frequency allocation information transmitted from the control station device 330.
  • the frequency changing device 313b changes the transmission frequency of the transmission unit 311 according to the extracted frequency allocation information (step Sc17).
  • the transmission unit 311 generates a transmission signal by changing the output frequency of the up-converter device 111b based on the allocated frequency, and transmits the transmission signal via the antenna 114 (step Sc18).
  • the transmission frequency transmitted by the base station apparatus 310 can be determined based on the interference state in the received signal received by the control station apparatus 330.
  • the communication systems 700c and 800c can efficiently perform the frequency arrangement used in each system in consideration of the frequencies. And it becomes possible to improve the quality of each communication system by reducing mutual interference.
  • FIG. 10 is a block diagram illustrating a functional configuration of a reception function included in the terminal station device 220 illustrated in the second embodiment.
  • the terminal station apparatus 220 includes a transmission unit 221, a reception unit 222, a control unit 223, and an antenna 124. 10, the same components as those shown in FIG. 6 are denoted by the same reference numerals.
  • the reception unit 222 includes a reception processing unit 222b, an interference information extraction unit 222c, a filter control unit 222d, a filter 222e, a demodulation unit 222f, a deinterleaver 222g, and an FEC decoding unit 222h.
  • the reception processing unit 222b performs down-conversion on the received reception signal and further performs analog / digital conversion.
  • the interference information extraction unit 222c based on the desired signal information determined when starting communication with the base station apparatus 210, the interference signal center frequency, the interference signal frequency bandwidth, the interference signal reception power, Interference information extraction processing is performed to extract the interference information including the signal from the received signal. Interference information extraction processing is possible with existing technology. For example, the interference information extraction unit 222c calculates the frequency spectrum of the received signal by performing FFT (Fast Fourier Transform) on the received signal, and obtains it based on the calculated frequency spectrum of the received signal and the desired signal information.
  • FFT Fast Fourier Transform
  • the frequency spectrum of the interference signal is estimated by calculating a difference from the estimation result of the frequency spectrum of the desired signal, and interference information is extracted based on the estimation result. Further, for example, the interference information extraction unit 222c may extract the interference information based on a frequency spectrum in a signal that is transmitted from the base station apparatus 210 at a predetermined timing and power is not allocated to subcarriers.
  • the filter control unit 222d stores desired signal information at the start of communication with the base station apparatus 210, and satisfies the following two conditions based on the desired signal information and the interference information extracted by the interference information extraction unit 222c.
  • the filter parameter is determined, and the determined filter parameter is set in the filter 222e. (1) A received signal in a frequency band in which only a desired signal exists without an interference signal is passed. (2) Attenuate the received signal in the frequency band where the interference signal exists.
  • the filter parameter includes, for example, a filter type and a cutoff frequency.
  • the filter 222e filters the received signal based on the filter parameter filter set by the filter control unit 222d. That is, based on the filter parameter filter set by the filter control unit 222d, the filter 222e filters the received signal referred to by the filter control unit 222d when determining the filter parameter.
  • the demodulator 222f removes the guard interval from the reception signal filtered by the filter 222e, performs FFT, and generates a demodulated signal by performing demodulation.
  • the deinterleaver 222g deinterleaves the demodulated signal generated by the demodulator 222f.
  • the FEC decoding unit 222h decodes the demodulated signal deinterleaved by the deinterleaver 222g in accordance with FEC (Forward Error Collection), generates a bit string in which error bits are corrected, and outputs received data. Further, the FEC decoding unit 222h calculates an error rate when generating a bit string decoded according to FEC and corrected in error bits.
  • FEC Forward Error Collection
  • the control information adding device 223a generates transmission information indicating the filter parameter determined by the filter control unit 222d and the error rate of the received data calculated by the FEC decoding unit 222h. Then, the transmission baseband signal generator 221a in the transmission unit 221 performs transmission information by performing processing such as encoding processing, modulation processing, digital / analog conversion processing, and up-conversion processing on the generated transmission information. A signal is generated, and the generated transmission information signal is transmitted to the base station apparatus 210 via the antenna 124.
  • the filter control unit 222d calculates a relative position between the desired signal and the interference signal based on the desired signal information and the interference information, and determines a filter parameter to be applied to the filter 222e according to the calculation result. Specifically, the filter control unit 222d selects the type of filter to be applied to the filter 222e based on the desired signal information and the interference information from among a high pass filter, a low pass filter, and a notch filter. Furthermore, the filter control unit 222d determines the cutoff frequency of the filter. Then, the filter control unit 222d controls the filter 222e according to the determined filter type and cutoff frequency.
  • FIG. 11A to 11C are schematic diagrams illustrating an outline of the filter control process when the filter control unit 222d sets a low-pass filter in the filter 222e.
  • FIG. 11A is a schematic diagram showing the frequency spectrum of the received signal received by the antenna 124 divided into the frequency spectrum of the desired signal and the spectrum of the interference signal.
  • the vertical axis represents power
  • the horizontal axis represents frequency
  • the symbol DS indicates the frequency spectrum of the desired signal
  • the symbol IS indicates the frequency spectrum of the interference signal.
  • the filter control unit 222d calculates the maximum value (bmax_i) of the frequency band of the interference signal based on the center frequency and the frequency bandwidth of the interference signal, and calculates the frequency band of the desired signal based on the center frequency and the frequency bandwidth of the desired signal.
  • bmax_i is higher than bmax_d (FIG. 11A)
  • a low-pass filter is applied to the filter 222e.
  • FIG. 11B is a schematic diagram illustrating an outline of a low-pass filter that the filter control unit 222d applies to the filter 222e.
  • the vertical axis represents gain (unit: dB), and the horizontal axis represents frequency (unit: Hz).
  • the filter control unit 222d calculates the minimum value (bmin_i) of the frequency band of the interference signal based on the center frequency and the frequency bandwidth of the interference signal, and the cutoff frequency of the low-pass filter (the gain of the low-pass filter is ⁇ 3 dB).
  • Frequency) fc is determined to be bmin_i.
  • the filter control unit 222d sets, in the filter 222e, a filter parameter whose filter type is a low-pass filter and whose cut-off frequency fc is bmin_i, as indicated by reference numeral FP.
  • FIG. 11C shows the result when the signal of FIG. 11A is filtered by the low-pass filter having the characteristics shown in FIG. 11B. As shown in the figure, it is shown that the interference signal is reduced by filtering. As described above, the case where the low-pass filter is applied has been described. However, the high-pass filter and the notch filter can be selected from the state of the detected interference signal. The cutoff frequency at that time is selected as described above.
  • the configuration shown in this figure is not limited to the receiving unit 222 in the terminal station device 220 described above, but the receiving unit 122 in the terminal station device 120 and the receiving unit 112 in the base station device 110 shown in the first embodiment.
  • the present invention can also be applied to the receiving unit 212 in the base station apparatus 210, the receiving unit 312 in the base station apparatus 310, and the like.
  • the spectrum arrangement in the control station that decides the arrangement can be performed.
  • Base station apparatuses 110, 210 and 310 defined as transmitting stations transmit multicarrier signals using a spectrum allocated to the own system.
  • the terminal station devices 120 and 220 defined as receiving stations recognize in advance the overlapping band with the other systems such as the communication systems 700 and 800 in the spectrum arranged in the own system.
  • the terminal station apparatuses 120 and 220 apply the interference suppression technique to the superimposed band, and receive a multicarrier signal addressed to the local station by performing error correction decoding on the signal to which the interference suppression technique is applied.
  • the spectrum is arranged such that the spectrum bandwidth and the superposition rate derived from a predetermined superposition bandwidth to be superposed on another spectrum are constant in each spectrum. In this way, by arranging the spectrum so that the superposition rate is constant in each spectrum, the frequency placement method that reduces the influence of superposition for each spectrum, ensures substantial communication quality, and effectively uses the frequency. Can be provided.
  • the spectrum bandwidth is variable for each communication system.
  • a spectrum with a narrow spectrum bandwidth is placed at the end of the use frequency band, and a spectrum with a wide spectrum bandwidth is placed in the use frequency band.
  • the spectrum is arranged so that the superposition ratio is constant in each spectrum.
  • a predetermined band can be secured even for a spectrum with a narrow bandwidth, and the entire transmission is performed by arranging the spectrum so that the overlapping rate is constant in each spectrum. Efficiency can be increased.
  • the terminal station apparatuses 120 and 220 perform interference suppression processing by removing the recognized superimposed band using a frequency filter. Thereby, a band including the interference wave can be removed, and the interference wave of the received reception signal can be suppressed.
  • the terminal station apparatuses 120 and 220 mask the likelihood of the received signal in the recognized superposed band (corresponding to the demodulated value of the subcarrier described above), and the error correction decoding step applies the received signal whose likelihood is masked.
  • interference correction processing is performed by error correction decoding, and a multicarrier signal addressed to the own station is received. Thereby, the spectrum including the interference wave can be removed, and the interference wave of the received signal received can be suppressed.
  • the spectrum is arranged based on the result detected by the interference wave detecting device 222a (interference signal detecting means) provided in the receiving station such as the terminal station device 220. This makes it possible to select a spectrum suitable for the reception environment at the receiving station, and to improve the reception quality at the receiving station.
  • the interference wave detecting device 222a interference signal detecting means
  • the spectrum is arranged based on the result detected by the interference signal detection device 122a (interference signal detection means) provided in the transmission station such as the base station device 110.
  • the interference signal detection device 122a interference signal detection means
  • the transmission station such as the base station device 110.
  • the spectrum arrangement is detected by an interference wave detecting device 331 (interference signal detecting means) provided in the control station device 330 different from both the base station device 310 (transmitting station) and the terminal station device 320 (receiving station). Arrange based on the results. This makes it possible to select a spectrum suitable for the reception environment in the control station device 330, and based on the information detected by the control station device 330, the own communication system (communication system 300) and other communication systems (communication). It is possible to centrally control the spectral arrangement of the systems 700c and 800c).
  • an interference wave detecting device 331 interference signal detecting means
  • the present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention. Any kind of encoding scheme can be used for the encoding scheme in the receiving method of the present invention, and the number of receivers and the connection form are not particularly limited.
  • the interference wave detection devices 112a and 222a shown in the above-described embodiments can be provided exclusively as an interference signal detection function for the purpose of frequency arrangement, and the purpose is to reproduce received information from a received signal.
  • the interference signal detection function may also be used.
  • band control is performed in the transmission unit 111 has been described in order to further improve frequency use efficiency. By performing the band control, an effect of increasing the frequency use efficiency can be obtained, but transmission may be performed in a predetermined band without performing the band control.
  • the communication system of the present invention corresponds to the communication systems 100, 200, and 300.
  • the transmission station apparatus of the present invention corresponds to the base station apparatuses 110, 210, and 310.
  • the receiving station apparatus of the present invention corresponds to the terminal station apparatuses 120, 220, and 320.
  • the control station apparatus of the present invention corresponds to the control station apparatus 330.
  • the interference signal detection unit of the present invention corresponds to the interference wave detection devices 112a, 222a, and 331.
  • positioning part of this invention is corresponded to the frequency allocation apparatuses 113a and 332.
  • the spectrum allocation unit of the present invention corresponds to the frequency allocation devices 113a and 332.
  • the control information distribution unit of the present invention corresponds to the control information distribution device 333. Further, the control information transmitting unit of the present invention corresponds to the control information adding device 223a.
  • the transmission unit of the present invention corresponds to the transmission units 111 and 311.
  • the receiving unit of the present invention corresponds to the receiving units 122 and 222.
  • control step of the present invention corresponds to a processing process by the control unit 113.
  • transmission step of the present invention corresponds to a processing process by the transmission units 111 and 311.
  • superposition band recognition step of the present invention corresponds to a processing process by the interference wave detection devices 112a, 222a and 331.
  • interference suppression step of the present invention corresponds to a processing process by the receiving units 120 and 220.
  • error correction decoding step of the present invention corresponds to a processing process by the receiving units 122 and 212.
  • spectrum allocation step of the present invention corresponds to a processing process by the frequency allocation devices 113a and 332.
  • spectrum allocation step of the present invention corresponds to a processing process by the frequency allocation apparatuses 113a and 332.
  • FIG. 12 shows an outline of the operation of the signal transmission apparatus (transmission station apparatus) according to the fifth embodiment of the present invention.
  • the signal transmission apparatus transmits a multicarrier signal such as OFDM (Orthogonal Frequency Division Multiplexing) and uses an FEC (Forward Error Correction) code as an error correction code.
  • This signal transmission apparatus transmits a plurality of FEC blocks arranged in the channel frequency band.
  • the signal transmission apparatus uses a subcarrier allocation method or a subcarrier interface in which a superposition rate (a ratio of using a superposition band in which interference occurs in a frequency band used for signal transmission) is variable.
  • a superposition rate a ratio of using a superposition band in which interference occurs in a frequency band used for signal transmission
  • Using the Lleaver scheduling is performed to give a superimposition rate according to the service quality requirement of each user, that is, QoS.
  • QoS the service quality requirement of each user
  • a large non-interference band is allocated for user data having a high QoS and transmitted with a low superposition rate
  • a large superimposition band is allocated for data for a user having a low QoS and a high superimposition rate is transmitted.
  • Control information is transmitted using only the non-interference band. This prevents loss of control information and high priority data.
  • a superimposition rate can also be given for every user according to the reception state of user data.
  • a large superimposition band is allocated and transmitted with a high superposition rate
  • a large non-interference band is allocated and transmitted with a low superposition rate.
  • the reception state is represented by D / U (Desired to Undesired signal ratio).
  • D / U 20 dB
  • the QoS requirement of user 2 is low
  • D / U 0 dB
  • the QoS requirement of user 3 is high
  • D / U 20 dB
  • the frequency band used for data transmission for a certain user is ⁇ and the interference band is ⁇ among the used frequency bands, the superimposition rate of the user is ⁇ / ⁇ .
  • FIG. 13 is a block diagram illustrating a configuration of the signal transmission device 1100 according to the present embodiment.
  • a signal transmission apparatus 1100 includes a variable superposition rate scheduler 1110, an OFDM modulator 1120, a P / S converter (parallel / serial converter) 1130, and a storage unit 1140.
  • the storage unit 1140 stores the QoS of each user, the reception quality received from the signal receiving device (receiving station device), and the SINR value estimated when the signal is received from the signal receiving device.
  • the storage unit 1140 assumes a minimum SINR (Signal-to-Noise ratio) value that can satisfy a required communication quality (Bit Error Rate, Frame Error Rate, etc.) assuming an antenna transmission line, What is calculated for each modulation and coding level for each variable superimposition rate is stored as a modulation and coding level table.
  • SINR Signal-to-Noise ratio
  • the variable superimposition rate scheduler 1110 includes an S / P converter (serial / parallel converter) 1111, a block superimposition rate determination unit 1112, a modulation / coding level determination unit 1113, encoding / modulators 1114-1 to 1114-n, and Subcarrier allocator 1115 is provided.
  • the S / P converter 1111 converts the transmission data from a serial signal to a parallel signal, and outputs a signal of each user to the encoders / modulators 1114-1 to 1114-1 to n for each user.
  • the block superposition rate determiner 1112 determines the superposition rate based on the QoS of each user stored in the storage unit 1140 and the reception quality in the signal receiving apparatus that receives the data of the user.
  • the modulation and coding level determiner 1113 refers to the modulation and coding level table stored in the storage unit 1140, and the superimposition rate determined by the block superimposition rate determiner 1112 and each of the storage units 1140 stored therein.
  • the modulation and coding level is determined from the estimated SINR value corresponding to the signal receiving apparatus that is the user's data transmission destination.
  • the encoders / modulators 1114-1 to 1114-1 to n encode the user data using the FEC code according to the modulation encoding level for each user determined by the modulation encoding level determination unit 1113, and modulate the encoded data. To the subcarrier allocator 1115.
  • the subcarrier assigner 1115 assigns the modulated data to the subcarriers in the interference band and the non-interference band according to the superposition rate determined by the block superposition rate determiner 1112 and outputs the data to the OFDM modulator 1120 as a parallel signal.
  • the OFDM modulator 1120 performs inverse Fourier transform on the parallel signal allocated to each subcarrier by the subcarrier allocator 1115 and outputs the result.
  • P / S converter 1130 serially converts the parallel signal output from OFDM modulator 1120 to generate an OFDM signal, and outputs it as a transmission signal.
  • FIG. 14 is a diagram illustrating a flow in a communication system using the signal transmission device 1100 described above.
  • the signal receiving apparatus performs interference band detection processing (step S111). This is because, for example, the signal receiving apparatus transmits a request for stopping wireless signal transmission using a desired wave to the signal transmitting apparatus 1100, and the subcarrier in the frequency band used for the desired wave in an environment where the desired wave is not transmitted. By detecting the presence / absence of other radio signals, signal strength, etc., the frequency band in which interference occurs can be detected. When the signal receiving device does not detect the interference band (step S112: NO), the process is terminated.
  • the signal receiving apparatus When the interference band is detected (step S112: YES), the signal receiving apparatus notifies the signal transmitting apparatus 1100 of information on the detected interference band (step S113), and turns on the interference compensation / suppression mechanism (step S114). .
  • the signal transmission device 1100 writes information on the interference band received from the signal reception device in the storage unit 1140.
  • the signal transmission device 1100 estimates SINR from the signal received from the signal reception device and writes it in the storage unit 1140.
  • the block superposition ratio determination unit 1112 When transmission data is input to the variable superposition ratio scheduler 1110 of the signal transmission apparatus 1100, the block superposition ratio determination unit 1112 refers to the storage unit 1140 and determines whether or not there is a superimposition band (interference band) (step). S121). When it is determined that there is a superimposition band (step S121: YES), the block superimposition rate determination unit 1112 determines whether the transmission data is control information or user data (step S122). When the transmission data is control information (step S122: control information), the block superimposition rate determiner 1112 determines to set the superimposition rate to 0, and the modulation coding level determination unit 1113 and the subcarrier allocator 1115 transmit the superimposition rate. Is output.
  • a superimposition band interference band
  • the modulation and coding level determiner 1113 calculates the modulation and coding level table stored in the storage unit 1140 based on the superposition rate determined by the block superposition rate determiner 1112 and the estimated SINR value stored in the storage unit 1140. Reference is made to determine the modulation and coding level.
  • the block superimposition rate determination unit 1112 reads the user QoS from the storage unit 1140, and the QoS level is higher or lower than a predetermined service quality level. Determine if there is.
  • the block superimposition rate determiner 1112 determines the superimposition rate of the user so as to be lower than the superimposition rate of the desired wave (step S125). ).
  • the modulation and coding level determiner 1113 uses the modulation and coding level table stored in the storage unit 1140 based on the superposition rate determined by the block superposition rate determiner 1112 and the estimated SINR value stored in the storage unit 1140. The user determines the modulation and coding level of the user.
  • the block superposition rate determiner 1112 determines whether the average superposition rate of all data is equal to the superposition rate of the desired wave calculated from the interference band information received in step S121 (step S126).
  • the subcarrier allocator 1115 performs coding and modulation according to the modulation and coding level determined by the determiner 1113, and the subcarrier allocator 1115 converts the encoded data of the user according to the superposition rate of each user determined by the block superposition rate determiner 1112. Allocation to subcarriers in interference area and non-interference band.
  • step S124 when the QoS level is lower than the predetermined service quality level (step S124: low), the block superimposition rate determiner 1112 determines that the superimposition rate of the user is higher than the superimposition rate of the desired wave. Is determined (step S128).
  • the modulation and coding level determiner 1113 calculates the modulation and coding level table stored in the storage unit 1140 based on the superposition rate determined by the block superposition rate determiner 1112 and the estimated SINR value stored in the storage unit 1140. The user determines the modulation and coding level of the user.
  • the signal transmission apparatus 1100 determines whether or not a communication link with the signal reception apparatus can be established depending on whether the modulation and coding level has been selected in step S128 (step S129). That is, the signal transmission apparatus 1100 refers to the modulation and coding level table, and determines that a communication link cannot be established with a superimposition rate at which no modulation and coding level that satisfies the required communication quality exists. If the communication link can be established (step S129: YES), the process from step S126 is executed to determine whether the average superposition rate of all data is different from the superposition rate of the desired wave. On the other hand, if the establishment of the communication link is not possible (step S129: NO), the processing from step S125 for lowering the superposition rate is executed.
  • the S / P converter 1111 of the signal transmission device 1100 determines which user's transmission data each transmission data is based on control data given to the transmission data or control data received from a control unit (not shown).
  • the transmission data is output to the encoders / modulators 1114-1 to 111-n for each user.
  • the S / P converter 1111 outputs user 1 data to the encoder / modulator 1114-1, outputs user 2 data to the encoder / modulator 1114-2, and encodes user 3 data.
  • the data of the user 4 is output to the encoder / modulator 1114-4.
  • the block superposition rate determiner 1112 determines the superposition rate of the encoded data of each user.
  • the reception quality includes, for example, D / U (Desired to Undesired signal ratio; DU ratio), S / N (Signal-to-Noise ratio; SN ratio), C / I (Carrier-to-interference; desired signal power pair). Interference wave power ratio) can be used, and each user's D / U, S / N, or C / I value is compared with a predetermined threshold value, and the reception quality is divided into two stages, high and low To do.
  • D / U, S / N, or C / I information is normally notified from a signal receiving apparatus by the uplink as request information from a user.
  • the modulation and coding level determiner 1113 uses the superposition rate determined by the block superposition rate determiner 1112 and the SINR value estimated for the signal receiving apparatus that is the transmission destination of the user data, stored in the storage unit 1140. With reference to the modulation and coding level table stored in the storage unit 1140, the modulation and coding level having the maximum transmission bit amount is selected from among the modulation and coding levels satisfying the required communication quality.
  • the modulation and coding level is indicated by the modulation method and coding rate. Examples of the modulation scheme include 16QAM (Quadrature Amplitude Modulation), 64QAM, and QPSK (Quadrature Phase Shift Keying).
  • the coding rate is (number of bits before coding) / (number of bits after coding). Therefore, the modulation and coding level is QPSK 1/2, 16QAM 3/4, or the like.
  • the encoders / modulators 1114-1 to 1114-1 perform encoding of the user data input thereto by applying FEC according to the modulation encoding level of the user set by the modulation encoding level determination unit 1113. Modulate the encoded data.
  • the encoder / modulator 1114-1 performs encoding and modulation based on the modulation encoding level of the user 1, and the encoder / modulator 1114-2 is adjusted to the modulation encoding level of the user 2.
  • the encoder / modulator 1114-3 performs encoding and modulation based on the modulation encoding level of the user 3, and the encoder / modulator 1114-4 performs the modulation encoding of the user 4. Encode and modulate based on level.
  • the subcarrier allocator 1115 assigns subcarriers to the modulation data of each user according to the superposition rate of each user determined by the block superposition rate determiner 1112, and outputs a parallel signal to the OFDM modulator 1120.
  • the OFDM modulator 1120 performs inverse Fourier transform on the parallel signal allocated to each subcarrier by the subcarrier allocator 1115 and outputs the result.
  • P / S converter 1130 serially converts the parallel signal output from OFDM modulator 1120 to generate an OFDM signal, and outputs it as a transmission signal.
  • the signal transmission device 1100 of FIG. 13 includes a plurality of encoders / modulators 1114-1 to 1114-1n, but may include only one.
  • the signal transmission apparatus 1100 uses the continuous subcarrier allocation method for transmission data for which control information and high-rank QoS are required, and allocates resources only to the non-interference band. assign.
  • the signal transmission apparatus 1100 performs scheduling such that resources distributed in the superposed band and the non-interference band are allocated using the distributed subcarrier allocation method. This prevents loss of control information and high priority data.
  • FIG. 17 is a schematic block diagram showing a configuration of a signal receiving apparatus 1300 that performs masking of an interference region.
  • the signal receiving apparatus 1300 includes an interference band detector 1301, a weighting coefficient generator 1302, a demodulator 1303, a weighting calculator 1304, and a decoder 1305, and receives a desired signal from a received signal composed of a desired wave and an interference wave by an error correction code. Extract the signal contained in the wave. Note that the connection between the interference band detector 1301 and the demodulator 1303 is not essential.
  • the interference band detector 1301 causes interference in the use frequency band in the desired wave of its own device by a radio signal transmitted from another system when the signal receiving apparatus 1300 such as FWA (Fixed Wireless Access) is installed. Detect the generated frequency band. For example, the interference band detector 1301 transmits a request to stop transmitting a radio signal using a desired wave to the desired radio wave transmission source radio station. In an environment where the desired wave is not transmitted, the interference band detector 1301 By detecting the presence / absence of other radio signals, signal strength, etc. for each subcarrier, a subcarrier in which interference occurs is detected.
  • FWA Fixed Wireless Access
  • the interference band detector 1301 is, for example, as a sequence of interference band determination values in which “1” is associated with subcarriers that are specific subcarriers and “0” is associated with subcarriers other than the specific subcarriers. Then, a sequence of specific subcarrier determination values is generated. Interference band detector 1301 outputs the detection result to weighting coefficient generator 1302.
  • the weighting coefficient generator 1302 calculates a weighting coefficient for each subcarrier according to the specific subcarrier determination value.
  • the weighting coefficient calculated by the weighting coefficient generator 1302 is a weighting coefficient that reduces the reliability of the subcarrier in which the interference detected by the interference band detector 1301 is generated as compared with other subcarriers.
  • the weighting coefficient generator 1302 outputs a column in which the calculated weighting coefficients are arranged for each subcarrier to the weighting calculator 1304.
  • Demodulator 1303 converts the received radio signal including the desired wave subjected to error correction coding into an electrical signal for each subcarrier, and outputs the demodulated demodulated value for each subcarrier to weighting calculator 1304.
  • the weighting calculator 1304 performs weighting calculation processing on the demodulated value input from the demodulator 1303 for each subcarrier based on the weighting coefficient input from the weighting coefficient generator 1302, and arranges the calculation results for each subcarrier.
  • the sequence is output to the decoder 1305 as a likelihood data sequence.
  • the decoder 1305 performs error correction processing and decoding processing based on the likelihood data string input from the weighting calculator 1304, and acquires a desired wave signal.
  • FIG. 18 is a diagram illustrating a processing flow of the signal reception device 1300.
  • the interference band detector 1301 of the signal receiving apparatus 1300 is a radio in the frequency band for each subcarrier of the desired wave at the time when the signal receiving apparatus 1300 is installed, at the timing where there is no desired wave or in the frequency band of the subcarrier where there is no desired wave.
  • Interference wave information is acquired by measuring and detecting the signal reception level, frequency band, center frequency, overlap band to the desired wave, and the like.
  • the interference band detector 1301 selects (detects) a subcarrier in which the interference wave exists as a specific subcarrier based on the acquired information on the interference wave. For example, based on the value of the reception level, the interference band detector 1301 detects a subcarrier in a frequency band that has received a signal having a reception level equal to or higher than a predetermined value as a specific subcarrier.
  • interference band detector 1301 detects subcarriers SC1 to SC4 included in overlap band W (interference band) where the desired wave and the interference wave overlap as specific subcarriers.
  • Interference band detector 1301 generates a sequence of specific subcarrier determination values in which “1” is associated with subcarriers SC1 to SC4 and “0” is associated with other subcarriers.
  • the interference band detector 1301 outputs the generated sequence of specific subcarrier determination values to the weighting coefficient generator 1302 (step S310).
  • weighting coefficient generator 1302 Based on the specific subcarrier determination value generated by interference band detector 1301, weighting coefficient generator 1302 generates a weighting coefficient that reduces the reliability of the specific subcarrier compared to other subcarriers.
  • This weighting factor is, for example, a weighting factor that converts a demodulated value into a predetermined value, for example, “0”, for a subcarrier associated with “1” in the column of specific subcarrier determination values.
  • the weighting coefficient generator 1302 outputs the generated sequence of weighting coefficients for each subcarrier to the weighting calculator 1304 (step S320).
  • Demodulator 1303 demodulates the radio signal in the frequency band of the desired wave for each subcarrier, and outputs the demodulated digital data for each subcarrier to weighting calculator 1304.
  • the weighting calculator 1304 Based on the weighting coefficient for each subcarrier and the demodulated value for each subcarrier, the weighting calculator 1304 performs a weighting calculation process using a calculation method according to the desired wave encoding method, and sets a column of calculation results as likelihood data. The data is output to the decoder 1305 as a sequence (step S330).
  • a weighting calculation method according to this encoding method a case where the desired wave encoding method is a soft decision positive / negative multi-value encoding method will be described as an example with reference to FIGS. 19B to 19D.
  • the decoding process in this soft decision positive / negative multi-value encoding method is a multi-value output in which the demodulated value of the received signal is positive / negative, and the magnitude of the absolute value is negative as a reliability (value representing likelihood, likelihood)
  • a decoding process is performed in which the value is “+1” and the positive value is “ ⁇ 1”.
  • FIG. 19B is a diagram illustrating a weighting coefficient for each subcarrier.
  • FIG. 19C is a figure which shows the demodulated value of the positive / negative multi-value output for every subcarrier.
  • the subcarrier with the maximum positive value “+27.02” has the highest reliability for being “ ⁇ 1”.
  • the subcarrier with the smallest negative value “ ⁇ 26.34” has the highest reliability of being “+1”.
  • whether the value is “+1” or “ ⁇ 1” is the most ambiguous (low reliability) is the subcarrier having the smallest absolute value, that is, the demodulated value of 0.
  • step S320 in FIG. 18 based on the weighting coefficient calculated by the weighting coefficient generator 1302, the weighting calculator 1304 weights the demodulated values of the subcarriers SC1 to SC4 that are specific subcarriers to “0”. By performing the arithmetic processing, the reliability of the demodulated values of the subcarriers SC1 to SC4 can be reduced.
  • the weighting coefficient generator 1302 generates a logical negation value of the specific subcarrier determination value of FIG. 19A as a string of weighting coefficients associated with each subcarrier.
  • the weighting calculator 1304 includes a weighting coefficient that is a logical negation value of the specific subcarrier determination value as illustrated in FIG. 19B and a weighting coefficient as illustrated in FIG. 19C.
  • the corresponding demodulated value is multiplied for each corresponding subcarrier.
  • the weighting calculator 1304 multiplies the demodulated value “ ⁇ 25.32” and the weighting coefficient “0” for the subcarrier SC1 that is the specific subcarrier, and the multiplication result “0” is weighted.
  • the demodulated value is output to the decoder 1305.
  • weighting calculator 1304 multiplies the demodulated value by the weighting coefficient “1” for subcarriers other than the specific subcarrier. Weighting calculator 1304 then outputs a sequence of multiplication results of all subcarriers to decoder 1305 as a likelihood data sequence.
  • FIG. 19D is a diagram showing a likelihood data string obtained by weighting a weighting coefficient and a positive / negative multilevel demodulated value for each subcarrier by the weighting calculator 1304.
  • the value of the likelihood data after the weight calculation corresponding to the subcarriers SC1 to SC4 which are specific subcarriers is the value “0” having the lowest reliability, and other demodulated values do not change. .
  • the decoder 1305 performs a decoding process corresponding to the desired wave encoding method based on the likelihood data string input from the weighting calculator 1304.
  • a method according to convolutional coding (Convolutional coding) or a combination of iterative decoding and turbo code can be applied (step S340).
  • the interference band detector 1301 measures the interference wave in the frequency band of the desired wave at the time of placement, and based on this measurement result, the weighting coefficient
  • the generator 1302 calculates a weighting coefficient for reducing the reliability
  • the weighting calculator 1304 performs processing for reducing the reliability of the specific subcarrier based on the weighting coefficient for the demodulated value of the received signal.
  • the signal receiving apparatus 1300 performs a weighting operation on the demodulated value according to the reliability of the received signal for each subcarrier, masks the specific subcarrier with low reliability, and demodulates the subcarrier with high reliability. It is possible to improve the reception error correction capability by decoding the received signal using.
  • the weighting coefficient calculated by the weighting coefficient generator 1302 is a logical negation value of the binary specific subcarrier determination value by the interference band detector 1301, and as a result is a bit mask.
  • the present invention is not limited to this, and the following coefficients may be used.
  • 20A to 20B are diagrams showing values before weighting and values after weighting in another example of the above-described weighting coefficients.
  • the weighting coefficient generator 1302 sets the weighting coefficient of a specific subcarrier to a predetermined value ⁇ (where 0 ⁇ ⁇ ⁇ 1) with respect to the demodulated value of positive / negative multilevel output, It is also possible to calculate a weighting coefficient with 1 as the weighting coefficient of the subcarriers.
  • the weighting calculator 1304 multiplies the demodulated value and the predetermined value ⁇ for the specific subcarrier to convert the absolute value of the demodulated value of the specific subcarrier in the 0 direction, thereby reducing the reliability. Further, in the case of a demodulated value of positive multivalue output in the soft decision output type, the bit value is decoded as “ ⁇ 1” as the demodulated value is closer to 0, and the bit value is “1” as the demodulated value is closer to the maximum value. ". In such a case, the weighting coefficient generator 1302 replaces the demodulated value of the specific subcarrier with the median value of the output candidate value (for example, the median value 3 or 4 if the output candidate value is 0 to 7). The weighting coefficient to be calculated may be calculated.
  • the weighting coefficient generator 1302 replaces the binary demodulated value with “0”.
  • the coefficient may be output to the weighting calculator 1304 as a weighting coefficient for the specific subcarrier.
  • error correction codes such as block coding are applied, and even if the demodulated values of some subcarriers are missing, the signal of the desired wave is acquired based on the demodulated values of other subcarriers.
  • the received error correction capability is improved by performing weighted arithmetic processing on the demodulated value using a weighting coefficient that lowers the reliability of subcarriers that have low reliability and cause errors. Can be made.
  • FIG. 21 is a block diagram illustrating a functional configuration of the signal reception device 1400.
  • the signal reception device 1400 includes an antenna 1401, a reception unit 1402, an interference information extraction unit 1403, a filter control unit 1404, a delay unit 1405, a filter 1406, a demodulation unit 1407, and a deinterleaver. 1408 and an FEC decoding unit 1409.
  • the antenna 1401 receives a signal in which a desired signal and an interference signal are combined.
  • the receiving unit 1402 performs down-conversion on the received reception signal, and further performs analog / digital conversion.
  • the interference information extraction unit 1403 receives the interference information including the center frequency of the interference signal and the frequency bandwidth of the interference signal based on the desired signal information determined when communication with the signal transmission apparatus is started. Interference information extraction processing extracted from
  • the interference information extraction unit 1403 calculates the frequency spectrum of the received signal by performing FFT (Fast Fourier Transform) on the received signal, and obtains it based on the calculated frequency spectrum of the received signal and the desired signal information.
  • the frequency spectrum of the interference signal is estimated by calculating a difference from the estimation result of the frequency spectrum of the desired signal, and interference information is extracted based on the estimation result.
  • the filter control unit 1404 stores desired signal information at the start of communication with the signal transmission device, and based on the desired signal information and the interference information extracted by the interference information extraction unit 1403, a filter that satisfies the following two conditions Are determined, and the determined parameters are set in the filter 1406. (1) Pass the received signal in the frequency band where only the desired signal exists without the interference signal (2) Attenuate the received signal in the frequency band where the interference signal exists Note that the filter parameters are, for example, Consists of type and cutoff frequency.
  • the delay unit 1405 adds a time delay corresponding to the time required for the interference information extraction unit 1403 and the filter control unit 1404 to end the processing after the reception unit 1402 ends the processing, To 1406.
  • the amount of delay that the delay unit 1405 adds to the received signal is set in advance by the designer.
  • the filter 1406 filters the received signal to which the delay is added by the delay unit 1405 based on the parameter filter set by the filter control unit 1404. That is, the filter 1406 filters the received signal referred to by the filter control unit 1404 when determining the parameter based on the parameter filter set by the filter control unit 1404.
  • the demodulation unit 1407 generates a demodulated signal by removing the guard interval from the received signal filtered by the filter 1406, performing FFT, and demodulating.
  • the deinterleaver 1408 performs deinterleaving on the demodulated signal generated by the demodulator 1407.
  • the FEC decoding unit 1409 decodes the demodulated signal deinterleaved by the deinterleaver 1408 according to FEC, generates a bit string in which error bits are corrected, and outputs received data.
  • FIG. 22 is a conceptual diagram showing frequency spectra of a received signal, a desired signal, and an interference signal.
  • the vertical axis represents power and the horizontal axis represents frequency.
  • FIG. 22A is a conceptual diagram illustrating a frequency spectrum of a signal received by the antenna 1401.
  • FIG.22 (b) is a conceptual diagram showing the frequency spectrum of the desired signal contained in the received signal of Fig.22 (a).
  • symbol DS indicates the frequency spectrum of the desired signal
  • fc_d indicates the center frequency of the desired signal
  • bw_d indicates the frequency bandwidth of the desired signal.
  • FIG.22 (c) is a conceptual diagram showing the frequency spectrum of the interference signal contained in the received signal of Fig.22 (a).
  • symbol IS indicates the frequency spectrum of the interference signal
  • fc_i indicates the center frequency of the interference signal
  • bw_i indicates the frequency bandwidth of the interference signal.
  • the filter control unit 1404 calculates a relative position between the desired signal and the interference signal based on the desired signal information and the interference information, and determines a filter parameter to be applied to the filter 1406 according to the calculation result. Specifically, the filter control unit 1404 selects a filter type to be applied to the filter 1406 from a high-pass filter, a low-pass filter, and a notch filter based on desired signal information and interference information. Furthermore, the filter control unit 1404 determines the cutoff frequency of the filter. Then, the filter control unit 1404 controls the filter 1406 according to the determined filter type and cutoff frequency.
  • 23 to 25 are schematic diagrams showing an outline of the filter control process performed by the filter control unit 1404. FIG. The details of the filter control process will be described below with reference to FIGS.
  • FIG. 23 is a schematic diagram illustrating an outline of a filter control process when the filter control unit 1404 sets a low-pass filter in the filter 1406.
  • FIG. 23A is a schematic diagram showing the frequency spectrum of the signal received by the antenna 1401 divided into the frequency spectrum of the desired signal and the spectrum of the interference signal.
  • the vertical axis represents power
  • the horizontal axis represents frequency
  • the symbol DS indicates the frequency spectrum of the desired signal
  • the symbol IS indicates the frequency spectrum of the interference signal.
  • the filter control unit 1404 calculates the maximum value (bmax_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and calculates the center frequency (fc_d) and frequency band of the desired signal Based on the width (bw_d), the maximum value (bmax_d) of the frequency band of the desired signal is calculated.
  • bmax_i is higher than bmax_d (FIG. 23 (a)
  • a low-pass filter is applied to the filter 1406.
  • FIG. 23B is a schematic diagram illustrating an outline of a low-pass filter that the filter control unit 1404 applies to the filter 1406.
  • the vertical axis represents gain (unit: dB), and the horizontal axis represents frequency (unit: Hz).
  • the filter control unit 1404 calculates the minimum value (bmin_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and the cutoff frequency (low-pass filter) of the low-pass filter.
  • the frequency at which the gain becomes ⁇ 3 dB is determined to be bmin_i.
  • the filter control unit 1404 sets, in the filter 1406, a parameter whose type of filter is a low-pass filter and whose cutoff frequency f_lpf is bmin_i, as indicated by reference numeral FP.
  • FIG. 23C is a schematic diagram showing the frequency spectrum after the received signal shown in FIG. 23A is filtered by the filter 1406 in which the low-pass filter shown in FIG. 23B is set. .
  • the filter 1406 attenuates the power of a signal having a frequency higher than the lowest value (bmin_i) of the frequency band of the interference signal regardless of whether the signal is a desired signal or an interference signal.
  • FIG. 24 is a schematic diagram illustrating an outline of a filter control process when the filter control unit 1404 sets a notch filter in the filter 1406.
  • FIG. 24A is a schematic diagram showing the frequency spectrum of the signal received by the antenna 1401 divided into the frequency spectrum of the desired signal and the spectrum of the interference signal.
  • the vertical axis represents power
  • the horizontal axis represents frequency
  • the symbol DS indicates the frequency spectrum of the desired signal
  • the symbol IS indicates the frequency spectrum of the interference signal.
  • the filter control unit 1404 calculates the highest value (bmax_i) and the lowest value (bmin_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and the center frequency of the desired signal
  • a notch filter is applied to the filter 1406.
  • FIG. 24B is a schematic diagram illustrating an outline of a notch filter that the filter control unit 1404 applies to the filter 1406.
  • the vertical axis represents gain (unit is dB), and the horizontal axis represents frequency (unit is Hz).
  • the filter control unit 1404 calculates the minimum value (bmin_i) and the maximum value (bmax_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and the notch filter
  • the values of f_bef1 and f_bef2 are determined to be bmin_i and bmax_i.
  • the filter control unit 1404 sets, in the filter 1406, a parameter in which the filter type is a notch filter and the two cutoff frequencies f_bef1 and f_bef2 are bmin_i and bmax_i, as indicated by reference numeral FP.
  • FIG. 24C is a schematic diagram showing the frequency spectrum after the received signal shown in FIG. 24A is filtered by the filter 1406 in which the notch filter shown in FIG. 24B is set. .
  • the filter 1406 determines the power of a signal having a frequency between the minimum value (bmin_i) and the maximum value (bmax_i) of the frequency band of the interference signal, whether the signal is a desired signal or an interference signal. Attenuate regardless.
  • FIG. 25 is a schematic diagram illustrating an outline of a filter control process when the filter control unit 1404 sets a high-pass filter in the filter 1406.
  • FIG. 25A is a schematic diagram showing the frequency spectrum of the signal received by the antenna 1401 divided into the frequency spectrum of the desired signal and the spectrum of the interference signal.
  • the vertical axis represents power
  • the horizontal axis represents frequency
  • the symbol DS represents the frequency spectrum of the desired signal
  • the symbol IS represents the frequency spectrum of the interference signal.
  • the filter control unit 1404 calculates the minimum value (bmin_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and calculates the center frequency (fc_d) and frequency band of the desired signal Based on the width (bw_d), the lowest value (bmin_d) of the frequency band of the desired signal is calculated.
  • bmin_i is lower than bmin_d (FIG. 25A)
  • a high-pass filter is applied to the filter 1406.
  • FIG. 25B is a schematic diagram illustrating an outline of a high-pass filter that the filter control unit 1404 applies to the filter 1406.
  • the vertical axis represents gain (unit is dB), and the horizontal axis represents frequency (unit is Hz).
  • the filter control unit 1404 calculates the maximum value (bmax_i) of the frequency band of the interference signal based on the center frequency (fc_i) and the frequency bandwidth (bw_i) of the interference signal, and cuts off the high-pass filter cutoff frequency (high-pass filter).
  • the frequency at which the gain becomes ⁇ 3 dB) f_hpf is determined to be bmax_i.
  • the filter control unit 1404 sets, for the filter 1406, a parameter whose filter type is a high-pass filter and whose cutoff frequency f_hpf is bmax_i, as indicated by reference numeral FP.
  • FIG. 25C is a schematic diagram showing a frequency spectrum after the received signal shown in FIG. 25A is filtered by the filter 1406 in which the high-pass filter shown in FIG. 25B is set. .
  • the filter 1406 attenuates the power of a signal having a frequency lower than the maximum value (bmax_i) of the frequency band of the interference signal regardless of whether the signal is a desired signal or an interference signal.
  • FIG. 26 is a flowchart illustrating a processing procedure when the signal reception device 1400 controls the filter.
  • the antenna 1401 receives a signal, and the receiving unit 1402 performs down-conversion and analog / digital conversion on the received signal (step S410).
  • the interference information extraction unit 1403 extracts interference information from the reception signal processed by the reception unit 1402 (step S420).
  • the filter control unit 1404 sets the determined filter type and filter cutoff frequency in the filter 1406 (step S440).
  • the delay unit 1405 adds a delay to the received signal (step S450).
  • the filter 1406 forms a filter in accordance with the parameters set in the process of step S440, and filters the received signal to which the delay is added, thereby attenuating the power in the frequency band where the interference signal exists in the received signal.
  • the demodulator 1407 demodulates the received signal that has passed through the filter 1406 to generate a demodulated signal (step S470).
  • the deinterleaver 1408 deinterleaves the demodulated signal (step S480).
  • the FEC decoding unit 1409 performs FEC decoding on the deinterleaved demodulated signal (step S490), outputs the decoded received data (step S500), and ends the processing of the entire flowchart.
  • the interference information extraction unit 1403 extracts the interference information
  • the filter control unit 1404 sets a filter parameter for attenuating the signal in the frequency band in which the interference signal exists in the filter 1406. Then, the filter 1406 filters the received signal, whereby the signal in the frequency band where the interference signal exists is attenuated among the signals included in the received signal. Therefore, it is possible to reduce the influence of the interference signal in the received signal.
  • the present invention can be used, for example, for communication of a multicarrier signal using a spectrum including a plurality of subcarriers.
  • ADVANTAGE OF THE INVENTION According to this invention, the frequency utilization efficiency of the utilization frequency band utilized for transmission of a multicarrier signal can be improved.

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PCT/JP2009/006594 2008-12-04 2009-12-03 制御局装置、送信局装置、通信方法、及び通信システム WO2010064438A1 (ja)

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CN200980147020.9A CN102224759B (zh) 2008-12-04 2009-12-03 控制站装置、发送站装置、通信方法和通信系统
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US13/128,206 US8798024B2 (en) 2008-12-04 2009-12-03 Control station device, transmitting station device, communication method, and communication system
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EP2352351A4 (de) 2012-04-11
JP5127932B2 (ja) 2013-01-23
EP2352351A1 (de) 2011-08-03
CN102224759A (zh) 2011-10-19
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KR20110090944A (ko) 2011-08-10
US8798024B2 (en) 2014-08-05

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